果实套袋是提高外观质量和减少农药污染的有效办法。自20世纪80年代在苹果产区推广以来,取得了明显效益。但在应用过程中,许多地方出现了果面发生黑点的问题,发病果率一般20%～30%,重的达50%～60%,大大影响了果实质量,成为困惑套袋栽培的1个突出问题。套袋苹果果面发生黑点的原 Fruit bagging is an effective way to improve appearance quality and reduce pesticide pollution. Since the 1980s in the Apple-producing areas to promote, and achieved significant benefits. However, in the application process, the problem of black spot on the fruit surface occurs in many places. The incidence of fruit is generally 20% to 30% and the weight is up to 50% to 60%, which greatly affects the quality of the fruit and becomes a puzzle of bagging cultivation A prominent problem. Bagging apple fruit black spot occurred